Abstract
Quaternized chitosan is a cationic biopolymer with good antibacterial activity, biocompatibility, and biodegradability, and it has been widely applied in many fields. We have developed a convenient method to evaluate the antibacterial activity of hydroxypropyltrimethylammonium chloride chitosan (HACC) with a nonionic surfactant poloxamer in aqueous solution by monitoring the change of the oxidation peak current in cyclic voltammetry. Increasing values of the oxidation peak current were positively correlated with the antibacterial activity of HACC–poloxamer solutions. Optical microscope images, the zeta potential, and fluorescence spectroscopy showed that the aggregation state of HACC–poloxamer was related to the ratio of the two polymers and also to the antibacterial activity and oxidation peak current. At an HACC-to-poloxamer ratio of 1:0.75, the maximum surface charge density and the smooth edge of HACC–poloxamer aggregates can accelerate diffusion in aqueous solution. It is expected that this convenient method can be applied for a quick evaluation of the antibacterial activity of cationic biopolymers in aqueous solution.
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Acknowledgements
This work was supported by the National Nature Science Foundations of China (81571812), the Priority Academic Program Development of Jiangsu Higher Education Institutions (1107047002), and Hydron Contact Lens Co. (8507040152).
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Wang, Y., Guo, Q., Wang, H. et al. Evaluation of the antibacterial activity of a cationic polymer in aqueous solution with a convenient electrochemical method. Anal Bioanal Chem 409, 1627–1633 (2017). https://doi.org/10.1007/s00216-016-0105-9
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DOI: https://doi.org/10.1007/s00216-016-0105-9